Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.7229 -32.3302 0.0116 4.8637 173.5421 1.6623892 16.617 TRIG_00318832
Foreground time interval of the image:
-26.552 41.437 (delta_t = 67.989 [sec])
Background time interval of the image:
-239.064 -26.552 (delta_t = 212.512 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -26.552 sec. to 179.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67467 ( -0.177902 0.181227 )
Norm@50keV : 7.02763E-04 ( -7.84184e-05 7.74007e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.29 using 59 PHA bins.
# Reduced chi-squared = 0.9350 for 57 degrees of freedom
# Null hypothesis probability = 6.149158e-01
Photon flux (15-150 keV) in 206.3 sec: 9.25242E-02 ( -0.00928261 0.00928804 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34519e-06 ( -1.57951e-07 1.61176e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -26.552 sec. to 179.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.976445 ( -0.906576 0.734504 )
Epeak [keV] : 63.3358 ( -16.7435 -63.3386 )
Norm@50keV : 1.73385E-03 ( -0.00104595 0.00386776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.70 using 59 PHA bins.
# Reduced chi-squared = 0.9053 for 56 degrees of freedom
# Null hypothesis probability = 6.751479e-01
Photon flux (15-150 keV) in 206.3 sec: 8.94445E-02 ( -0.0098159 0.0098199 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2348e-06 ( -1.86532e-07 1.96769e-07 ) ergs/cm2
Band function
Time interval is from -26.552 sec. to 179.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90492 ( -6.08656 -4.90492 )
beta : -1.91583 ( -0.310655 0.238364 )
Epeak [keV] : 26.8730 ( -4.15843 3.86209 )
Norm@50keV : 49.3719 ( -4.86667 180.354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.48 using 59 PHA bins.
# Reduced chi-squared = 0.8632 for 55 degrees of freedom
# Null hypothesis probability = 7.543835e-01
Photon flux (15-150 keV) in 206.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2829e-06 ( -1.28146e-06 -1.61221e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6838 (-1.36684 1.60154)
R^2/D10^2 : 2.46336E-02 (-0.0092902 0.0144398)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.43 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.074194e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.463e-07 2.551e-08
25- 50 4.461e-07 6.055e-08
50-150 3.596e-07 9.046e-08
15-150 9.520e-07 1.269e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 125.692 (-44.371 -124.588)
Norm : 0.391167 (-0.0461766 0.0596753)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.8957 for 57 degrees of freedom
# Null hypothesis probability = 6.965939e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.097e-07 3.137e-08
25- 50 3.782e-07 7.901e-08
50-150 6.903e-07 3.451e-07
15-150 1.278e-06 4.277e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22143 (-2.08657 2.3457)
R1^2/D10^2 : 9.88482E-02 (-0.0566718 0.191425)
kT2 [keV] : 24.1308 (-8.05649 37.3916)
R2^2/D10^2 : 1.20588E-03 (-0.00113391 0.00467384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8899 for 55 degrees of freedom
# Null hypothesis probability = 7.040368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.019e-07 8.869e-08
25- 50 3.990e-07 1.702e-07
50-150 6.665e-07 3.579e-07
15-150 1.267e-06 5.873e-07
Peak spectrum fit
Power-law model
Time interval is from 1.708 sec. to 2.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20474 ( -0.51574 0.483638 )
Norm@50keV : 4.43585E-03 ( -0.00108748 0.00108754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.95 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.357925e-01
Photon flux (15-150 keV) in 1 sec: 0.521027 ( -0.131541 0.132428 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49441e-08 ( -1.248e-08 1.28709e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.708 sec. to 2.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21006 ( -0.527768 0.478214 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.45500E-03 ( -0.00109313 0.0143847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.022308e-01
Photon flux (15-150 keV) in 1 sec: 0.522681 ( -0.13346 0.130598 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50208e-08 ( -1.27122e-08 1.24752e-08 ) ergs/cm2
Band function
Time interval is from 1.708 sec. to 2.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97830 ( -4.9783 -4.9783 )
beta : -1.24999 ( -0.624195 0.539435 )
Epeak [keV] : 22.7017 ( -22.7017 16.7277 )
Norm@50keV : 629.626 ( -153.959 2.23328e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.73 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 55 degrees of freedom
# Null hypothesis probability = 2.770856e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.0687 (-5.88136 11.4656)
R^2/D10^2 : 3.13878E-02 (-0.0309317 0.0852738)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.62 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.797562e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.049e-09 1.297e-09
25- 50 9.504e-09 5.720e-09
50-150 2.255e-08 1.387e-08
15-150 3.410e-08 2.029e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-101.037 -199.363)
Norm : 2.14542 (-0.536575 0.536575)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.73 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.805232e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.342e-09 3.201e-09
25- 50 1.028e-08 6.200e-09
50-150 2.254e-08 1.363e-08
15-150 3.816e-08 2.229e-08
Double BB
R1^2/D10^2 : 0.189304 ( )
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.08693E-04 (-3.47393e-05 0.000122712)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.51 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.45 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.44 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.838015e-01
# Null hypothesis probability = 2.854491e-01
# Null hypothesis probability = 2.859257e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.214e-09 2.643e-09
25- 50 1.012e-08 5.620e-09
50-150 3.419e-08 2.087e-08
15-150 4.853e-08 2.543e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63644 ( -0.171574 0.173852 )
Norm@50keV : 1.29144E-03 ( -0.000136974 0.000135437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.50 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 57 degrees of freedom
# Null hypothesis probability = 1.238643e-01
Photon flux (15-150 keV) in 67.99 sec: 0.167885 ( -0.016303 0.0163143 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.17763e-07 ( -9.23522e-08 9.40859e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.916301 ( -0.942401 0.747549 )
Epeak [keV] : 64.9025 ( -17.1384 -64.9081 )
Norm@50keV : 3.28204E-03 ( -0.00200704 0.00787782 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.84 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.523258e-01
Photon flux (15-150 keV) in 67.99 sec: 0.162041 ( -0.017431 0.017377 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.46306e-07 ( -1.13184e-07 1.18955e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97951 ( -14.8662 -4.97951 )
beta : -1.83832 ( -0.283068 0.218961 )
Epeak [keV] : 25.9110 ( -4.85765 4.0955 )
Norm@50keV : 124.652 ( -11.8718 349.811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.04 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.133117e-01
Photon flux (15-150 keV) in 67.99 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60115e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.60e-07
S(50-100 keV) = 4.51e-07
T90 vs. Hardness ratio plot
T90 = 179.503999978304 sec.
Hardness ratio (energy fluence ratio) = 1.25278
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.25585
Count Ratio (50-100 keV) / (15-25 keV) = 0.708067
Mask shadow pattern
IMX = -8.455161124743028E-02, IMY = -9.570568996833929E-03
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-239.064000 -26.552000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9731 -15.6420 0.4 25.0 -49.4 6.6167 28.2 0.4 Sco X-1
256.1350 -37.8474 16.7 14.4 -120.9 0.1352 0.7 7.0 4U 1700-377
256.5846 -36.4187 3.4 13.2 -117.1 0.6741 3.4 7.2 GX 349+2
263.1259 -24.8734 6.4 5.7 -43.2 0.3624 1.8 10.0 GX 1+4
264.5781 -44.5712 7.7 17.0 -154.2 0.3023 1.5 10.1 4U 1735-44
268.3795 -1.4286 2.2 26.4 15.9 1.1544 5.3 1.6 SW J1753.5-0127
270.2948 -25.0071 2.2 3.3 45.9 1.0045 5.2 4.4 GX 5-1
270.4288 -25.6493 4.8 2.8 54.5 0.5026 2.5 8.9 GRS 1758-258
274.0042 -14.0585 3.3 14.7 37.7 0.7002 3.5 1.3 GX 17+2
275.8785 -30.3995 2.5 6.9 129.5 0.8769 4.7 3.1 H1820-303
285.2162 -25.0018 4.8 15.2 99.2 0.4917 2.4 11.0 HT1900.1-2455
288.7934 10.9009 4.1 43.5 45.9 1.8694 2.9 2.7 GRS 1915+105
262.9319 -33.8924 2.4 7.7 -126.8 0.9618 4.8 4.5 GX 354-0
333.1862 -55.0116 3.1 53.2 155.8 4.3603 3.7 ------ UNKNOWN
278.3592 13.9271 2.1 42.9 30.3 2.3278 5.6 ------ UNKNOWN
278.5370 -13.0355 2.1 17.5 50.5 1.0699 5.5 ------ UNKNOWN
325.7487 -73.1877 3.2 54.1 178.7 2.8485 3.6 ------ UNKNOWN
278.6495 -53.5424 2.3 26.7 -177.2 1.0434 5.0 ------ UNKNOWN
275.7964 -65.7524 2.0 38.2 -168.6 1.4430 5.8 ------ UNKNOWN
206.5144 -72.6773 4.8 55.3 -145.1 3.3360 2.4 ------ UNKNOWN
225.9556 1.9574 2.5 50.6 -44.8 4.8379 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-26.552000 41.436620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1044 -15.4743 24.7 25.0 -48.9 0.0594 0.5 12.3 Sco X-1
256.0550 -37.9841 4.7 14.5 -121.1 0.2802 2.5 9.0 4U 1700-377
256.5854 -36.2548 0.0 13.1 -116.6 -0.2377 -2.2 12.4 GX 349+2
263.1014 -24.8789 3.0 5.7 -43.4 -0.3836 -3.8 9.5 GX 1+4
264.6709 -44.5204 12.2 16.9 -154.4 -0.0952 -0.9 5.2 4U 1735-44
268.2848 -1.3206 5.9 26.5 15.7 -0.2330 -2.0 9.4 SW J1753.5-0127
270.2153 -24.9415 17.1 3.3 44.3 -0.0706 -0.7 9.1 GX 5-1
270.4794 -25.7513 20.4 2.7 56.5 0.0605 0.6 9.6 GRS 1758-258
273.9111 -14.2201 0.0 14.5 37.5 0.1579 1.5 12.3 GX 17+2
275.7051 -30.2796 737.0 6.7 129.0 0.0016 0.0 12.5 H1820-303
285.1515 -24.7851 5.1 15.2 98.4 0.2652 2.3 10.3 HT1900.1-2455
288.8396 10.9785 10.5 43.5 45.9 -0.4051 -1.1 3.1 GRS 1915+105
263.1762 -33.9114 8.5 7.6 -128.0 0.1368 1.4 10.4 GX 354-0
270.7229 -32.3301 0.7 4.9 173.5 1.6623 16.6 ------ UNKNOWN
279.8439 -53.0811 2.2 26.6 -179.1 0.5914 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
67.036600 404.336600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9764 -15.6408 0.5 28.7 -49.7 9.2757 24.7 0.2 Sco X-1
256.1260 -37.7435 3.4 13.1 -107.5 0.9525 3.4 9.0 4U 1700-377
256.4093 -36.3859 13.1 12.5 -102.0 0.2461 0.9 2.6 GX 349+2
263.1090 -24.8840 6.5 10.0 -33.0 0.4637 1.8 9.9 GX 1+4
264.9622 -44.5755 95.6 13.1 -150.5 -0.0350 -0.1 12.0 4U 1735-44
268.3428 -1.4878 1.6 30.9 6.3 2.2694 7.0 2.6 SW J1753.5-0127
270.2905 -25.0505 1.7 7.3 7.7 1.7417 7.0 1.8 GX 5-1
270.3108 -25.6880 4.0 6.6 7.5 0.7760 3.1 3.3 GRS 1758-258
274.0193 -13.9909 3.4 18.6 21.0 0.9039 3.4 2.8 GX 17+2
275.8567 -30.3120 3.0 4.8 77.6 1.0181 3.8 4.8 H1820-303
285.0520 -25.0538 4.3 14.5 74.5 0.7171 2.7 8.0 HT1900.1-2455
288.7976 10.9824 3.0 46.6 35.7 3.4171 3.9 2.2 GRS 1915+105
263.0938 -33.7964 3.3 6.6 -94.1 0.9851 3.5 5.7 GX 354-0
322.4896 -36.6978 2.6 42.4 121.8 4.8780 4.4 ------ UNKNOWN
311.5024 -46.1973 3.1 34.0 137.0 1.7563 3.8 ------ UNKNOWN
236.0012 11.9969 3.2 55.4 -31.7 5.6540 3.6 ------ UNKNOWN
229.3365 -5.4242 3.7 47.0 -53.2 4.3568 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 06:45:44 EDT 2015